Grate for concentrator-jigs.



S. P. ROBINSON; GRATE FOR GONOENTRATOR ms.

APPLICATION FILED IEB.25,-1909.

I Patented May 31, 1910.

v awuaubo fi I sirrll'lg P/Qaidzson STERLING P. ROBINSON, OF GALENA, KANSAS.

GRATE FOR CONCENTRATOR-JIGS.

Specification of Letters Patent.

Patented May 31, 1910.

Application filed February 25, 1909. Serial No. 479,956.

To all whom it may concern:

Be it known that I, STERLING P. ROBINSON, a citizen of the United States of America, residing at Galena, in the county of Cherokee and State of Kansas, have invented new and useful Improvements in Grates for Concentrator-Jigs, of which the following is a specification.

This invention relates to grates for concentrator jigs, and one of the principal objects of the same is to provide a grate which will not rust or corrode in use, which will not readily clog, and which will hold its shape and will not become impaired by continuous use.

Another object of the invention is to provide a grate having wooden bars of novel form, said bars being fitted to a frame and provided with means for holding the same in properly spaced relation.

These and other objects may be attained by means of the construction illustrated in the accompanying drawing, in which,

Figure 1 is a plan view of a grate made in accordance with my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a longitudinal vertical sectional view on the line AB, Fig. 1. Fig. d is an enlarged detail perspective view of one corner of the grate, some of the bars and the keeper strap being shown in section. Fig. 5 is a detail perspective view illustrating one end of one of the grate bars. Fig. 6 is an end view of one of the longitudinal keeper bars.

Referring to the drawings, 1 represents a rectangular shaped frame constructed of suitable material and having its corners joined by gaining, as clearly shown in Fig. i of the drawings. The sides comprising said frame are provided at their upper edges with V-shaped notches 4 properly separated or spaced, presenting an upper smooth surface to the oppositely located sides of the frame, upon which surface longitudinal strips 2 are secured for holding the several parts together as will hereinafter more fully appear. The grate bars 3 are substantially V-shaped in cross section and correspond to the V-shaped notches formed in the opposite transverse members of the rectangular frame 1, said bars being cut away at their opposite ends as shown at a forming vertical shoulders I), the width of said cut away por tions corresponding in width to the said opposite side members of the frame in order to cause the upper surfaces of the grate bars to be on a plane with the upper edges of the transverse members of said frame. After the bars thus constructed have been properly located within the frame, keeper bars 2 are secured to the upper surfaces or edges of the longitudinal members of the frame and over the cut away portions a formed at the ends of the grate bars 3, the shoulders I) abutting or being in contact with the inner edges of said keeper bars, whereby the parts are held in a rigid position in respect to one another and a uniform surface is presented to the grate thus constructed. Passing longitudinally across the grate, are bars 2 which are dovetailed in cross section and are adapted to receive correspondingly shaped recesses formed in bot-h the grate bars and transverse members of the frame 1, the upper edges of said bars 2 being also on a plane with the remaining parts previously referred to. The parts thus assembled are secured in their relative position in respect to one another by suitable screws or other fastening devices 5 as clearly shown in Fig. l of the drawings.

It will be observed from the foregoing description that a grate thus constructed will be compact and simple in its construction and further withstand the rough usage to which the same is necessarily subjected, and further that the parts can not become displaced or inoperative while in use.

Having fully described my invention, what I claim is The herein described grate for concentrator jigs comprising a rectangular frame, the opposite longitudinal upper edges of which are provided with V-shaped notches properly spaced along their length, grate bars V-shaped in cross section and having their opposite ends cut away to form notches, keeper bars extending over said cut away ends of the bars, the upper surfaces of which are flush or on a plane with the grate bars, intermediate longitudinal bars extending the full length of the grate thus formed and dovetailed in cross section, said bars being adapted to be received by correspondingly l one another as and for the purpose Cleshapecl depressions formed in both the grate scribed. 10 bars and oppositely located transverse walls In testimony whereof I affix my signature of the frame in such a manner as to cause the in presence of two Witnesses.

upper surfaces of the intermediate bars to STERLING P. ROBINSON.

be on a plane With the remaining construc- WVitnesses:

tion and suitable means for fastening the R. A. COLES,

several parts in rigid position in respect to JAMES LEGGETT. 

